1  Fork:
 2    type: object
 3    description: "The [`Fork`](https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/beacon-chain.md#fork) object from the Eth2.0 spec."
 4    properties:
 5      previous_version:
 6        $ref: "./primitive.yaml#/ForkVersion"
 7      current_version:
 8        $ref: "./primitive.yaml#/ForkVersion"
 9      epoch:
10        $ref: "./primitive.yaml#/Uint64"
11  
12  Checkpoint:
13    type: object
14    description: "The [`Checkpoint`](https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/beacon-chain.md#checkpoint"
15    properties:
16      epoch:
17        $ref: "./primitive.yaml#/Uint64"
18      root:
19        $ref: "./primitive.yaml#/Root"